The Rainbow tables technique pre-computes the hash value, saving time at the expense of creating very large tables.

Rainbow表方法是预先算出hash值，通过创建很大的表格而节省时间。

youdao

But it is possible to attack the hashed value of your password using rainbow tables: enormous, pre-computed hash values for every possible combination of characters.

但是有可能通过rainbow表去攻击密码的hash值：预先计算出来的数量庞大的hash值，涵盖所有可能的字符组合。

youdao